how to use thread without locking up terminal

[ThiefOfTime]

Lists and arrays are always passed as a reference if you do a simple assignment. But there is an easy way to solve this problem.

a = [1, 2, 3, 4]
last = list(a)

now a copy of list a is made and passed to last.

import numpy as np
a = np.array([1,2,3,4])
last = a.copy()

a copy is made of the array and then passed to last.